Figure 5: SEM images of sputtered Pt on carbon paper: (a) MEA1 with one layer of 0.05 mg/cm²; (c) MEA2 with two layers of 0.025 mg/cm²; (e) MEA3 with two layers of 0.015 mg/cm² and a third layer of 0.02 mg/cm² with their magnitude (b), (d), and (f), respectively.